| 朱岩,李喜德,李墨菡,刘记立*,黄维.柱状晶Cu-Al-Mn形状记忆合金内耗性能的各向异性及其时效影响研究[J].实验力学,2022,37(6):847~857 |
| 柱状晶Cu-Al-Mn形状记忆合金内耗性能的各向异性及其时效影响研究 |
| Anisotropy and the effect of aging on internal friction property of columnar crystal Cu-Al-Mn alloy |
| 投稿时间：2021-10-21 修订日期：2022-05-09 |
| DOI：10.7520/1001-4888-21-244 |
| 中文关键词: Cu-Al-Mn合金 形状记忆合金 内耗性能 阻尼系数 各向异性 时效析出 |
| 英文关键词:Cu-Al-Mn alloy shape memory alloy internal friction properties damping coefficient anisotropy aging precipitation |
| 基金项目:国家自然科学基金(51974217)；新金属材料国家重点实验室开放基金(2020-Z13) |
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| 中文摘要: |
| 由于形状记忆合金在热弹性马氏体相变中具有能量耗散特性，因此在工程结构、机械仪器和土木建筑等领域具有较大的应用潜力。本文采用X射线衍射分析、差示扫描量热分析、动态热机械分析、显微分析等实验方法，研究了不同频率下各向异性和时效热处理对自研柱状晶Cu-Al-Mn形状记忆合金内耗性能的影响。结果表明，频率对Cu70.8<\sub>Al17.8<\sub>Mn11.4<\sub>形状记忆合金内耗性能有明显影响。在0.5Hz和1Hz的低频时，0°和15°合金试样的内耗能力高于其他试样，阻尼系数tanΦ的峰值分别为0.12和0.13，内耗能力随着各向异性角度的增大呈现出曲折降低（增加-降低-增加-降低）的趋势；在5Hz~20Hz的高频范围内，随着频率的增加，不同角度试样的阻尼系数均降低，且都低于0.04。随着由时效处理而产生的贝氏体析出相的增加，Cu70.8<\sub>Al17.8<\sub>Mn11.4<\sub>合金的内耗能力出现先增加后下降的变化趋势，且发现析出极少量的贝氏体可以增大合金在低频下的内耗性能，tanΦ峰值最大可达到0.13~0.16。以上现象符合贝氏体对马氏体相界面运动的钉扎机制。 |
| 英文摘要: |
| Shape memory alloys with high performance and low cost have great potential applications in engineering structures, mechanical instruments, civil architecture, and other fields, due to their energy dissipation properties during thermoelastic martensitic transformation. In this paper, the damping internal friction properties of self-developed columnar grain Cu-Al-Mn shape memory alloy under variable frequency and temperature were studied. X-ray diffraction, differential scanning calorimetry, dynamic thermo-mechanical analysis, microscopic analysis, and other experimental methods were used to analyze the anisotropy of internal friction properties and the effect of aging treatment at different frequencies. The results show that the damping coefficient of Cu71.3Al18.6<\sub>Mn10.1<\sub> alloy is obviously affected by the frequency. At the low frequency of 0.5Hz and 1Hz, the damping capacity of 0° and 15° alloy specimens is better than other specimens. And the peak value of damping coefficient tanΦ is 0.12 and 0.13, respectively. The damping capacity decreases zigzag with the increase of the anisotropy Angle. At the high frequency of 5Hz~20Hz, with the increase of frequency, the damping coefficients of samples at different angles decrease and are all lower than 0.04. After aging, the internal friction capacity of Cu70.8<\sub>Al17.8<\sub>Mn11.4<\sub> alloy increases initially and then decreases with the increase of bainite precipitates. A very small amount of bainite can increase the internal friction properties of the alloy at low frequencies, and the maximum tanΦ can reach 0.13~0.16, which is related to the pinning mechanism of bainite relative to the martensite phase transformation interface. |
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